Let-off



H. I. SATTLER, SR.

LELOFF. l APPLICATION FILED MAY 4, I.92I.

Patented May 30, 1922.

2A SHEETS-sun 2,.

grief/mg' dated March 13, 1912.

STATES rAraNr orties.

HERMAN J'. SATTLER,

SR., 0F QUAKE/ltTOWN, PENNSYLVANIA.

Application filed May 4, 1921.

T 0 all whom 'it may concern:

Be it known that I, HERMAN J'. SAT- nnnn, Sr., a citizen of the United States, residing at Quak'ertown, in the county ofv Bucks and State of Pennsylvania, have invented certain new and useful mprove ments in Let-Offs, of which the following" is a specification. i

This invention relates to improvements i'n let-0E devices for the warp beams of looms, and more particularly to the friction type of let-off, disclosed in my Patent No. 1,019,993,

The invention has for its object to provide an improved structure which eliminates wear of the parts and the resultant impairment in the proper operation of the mechanism.

A provide further object of the invention is to a novel and improved, means for varying the degree 0f the frictional engagement of the dev ice with the-warp head.

The objects stated are attained by means of a combination and arrangement of parts to be hereinafter described and claimed, and in 'order that the same may be better understood,'reference is had to the accompanying drawing formingfa part of this specification.

1n the drawing,

Figurejl is a side elevation of the mechanism; Fig. 2 is a front elevation thereof;

' Fig. 3l is a sectional detail View; Fig. 4 is a View similar to Fig. 1 showing a modification; Fig. v5 1s an enlarged section on the line 5-5 of Fig. 4, and Fig. (3 1s a View f similar to Fig. 3 showing the modification.

Referring specifically to the drawing, 5 denotes the warp head at one end of the 'warp beam, a fragment 0f the latter being shown at 6. The warp head is encircled by a band 7 of leather "or other suitable flexible .Warp head.

material which is riveted or otherwise secured to an outer metal band 8. r1`his assembly of leather and metal bands forms a friction band, the inner or leather portion being engageable with the periphery of the The friction band is not continuous, but it is split or divided so that it may be contracted more or less to grip the warp head, and vby the friction 'fthus produced resi'stthe rotation thereof and thereby allow the warp threads to be unwound from Specification of Letters Patent. Patented lvlay 30, 1922,`

Serial No. 466,713.

the beam as fast as the cloth or other material is woven, and yet at'all times keep a proper tension on the warp threa'ds. The warp head 5 is provided with radial apertures 9 opening through the periphery thereof, the purpose of whichwill be presently ldescribed.

To one end of the outer portion 8 -of the friction band is riveted or otherwise secured a shoe 10 provided with a slotted ea'r 11 to which is pivoted, as shown at 12, a lever 13 having at one of its ends lateral extensions 14 and 15. The extension 14 carries a pin 16 which passes through a perforation in the shoe and an alined perforation in the friction band, so that 'it may seat in one of the apertures 9. The extension 1'5 works in the slot of the ear 11, and is adapted to engage a transverse bolt 17 whereby the swing of the lever 13 is limited, and the pin 16 is prevented from being pulled out of the perforation in the shoe 10.

To the bolt 17 is connected one end of a chain, or other iexible element'18, which latter, after being given several turns around the outside of the friction band, has attached to its other depending end a weight 19. The band 8 carries outstanding pins 20 between which the chain is located and which prevent it from slipping sidewise off the band.

The free end of the lever 13 carries'a weight 21 which tends to swing the same in a direction to insert the pin 16 into one of the apertures 9. On the pin 16 are mounted washers 22 for taking up wear, one washer after the other being` removed as the length of the pin is reduced by wear.

The bolt 17, alongside the ear 11, carries a block 23 through which slidably passes the threaded shank 24 of a hook 25. To this hook is anchored one end of a short chain or other iiexible device 2G carrying a hook27. Back of the block 23, the shank 24 is provided with an adjusting nutQS, and a lock nut 29 for the latter. i

As shown in Fig. 1, the pin 16 is extending into one of the apertures 9 in the w 1' head 5, whereby the friction right of the vertical center line of th Warp head, so that it tends to hold-the piny 16 1n l j of the vertical locking position. As the warp head continues to rotate in the direction of. the arrow, the friction band, rotating with the warp head, carries the lever bot ily in the direction of the vertical center line of the warp head and over to the left side thereof, whereupon the lever automatically tilts and'withdraws the pin 16 from the aperture 9. The friction band is now unlocked lfrom the warp head, and it is free to turn or slide to the right, carrying the lever -in the saine direction, and when the lever passes to the right center line of the warp head it tilts to the left and again inserts t ie pin 16 into one 0f the apertures 9 to lock the friction band to the warp head. The. movement of the friction baud to the right, when it is unlocked from the warp head, is effected by the weight 19.

The operation of the device is to-all intents and purposes the same as the device disclosed in my Patent No. 1,919,993, hereinbefore mentioned'. However the present structure is more eicieiit and reliable. In the patented sti'ucture the rope, chain or other flexible element wound around the warp head is subject to rapid wear and weakening of its friction with the warp head, and the latter direct contact of the shoe therewith. In the present structure. the chain or other ffexible element, as well as the shoe, are not iii con- 'tact With the wai'p head, and only the ,iiiner portion of the friction 'band is in contact with the warp head, and when this portion of the band, which can be made of leather or woven material, becomes worn out, it can be easily renewed. The chain also produces no wear on the inner portion of the friction band as it lis wrapped around the outer metal baud H. and this also distributes the friction more evenly on the warp head.

The frictional engageiiient of the band 7 with'the warp head 15 is produced b v the chain 18, the weight 19 attached to the free cndof the latter tending to draw the chain tight around they band and thereby acting' to hold the saine against the waip head. The tension of the chain on the friction band may be varied by connecting the hook 27 to some part of the chain passing around the warp head.' Assuming that the cliaiii is wrapped aroundthe warp head thrice, then if the hook 27 is coupled to the chain at the second turn or convolution f'roin its fixed end, it will be evdeiit that the weight 19 is now-pulliiig ononly one turn or convolution of the chain and only this portion of the ciliain is acting on the band to obtain the fr ,tional engagement of the same. with the warp head. If more friction is desired it is necessary only to couple the hook to the chain at a point nearei' its fixed end, as for instance, the first turn or conis also worn by the lthereof oi' eccentrically After the yhook 27 is coupled to the chain 1S, it can be drawn back, by operating the nut 28, until the chain is slack from the point of attachment of the hook to the fixed end of' the chain, and by nut 29 the adjustment tained.

The preferred embodiment of the invention has been disclosed but it will be understood that many changes and modifications may be made without a departure from the spirit and scope ofthe invention as claimed' hereinafter. It will also beunderstood that the invention may be employed viiil connection with paper feeding rolls and other devices requiring a let-off mechanism.

Figs. t to 6 disclose a modified structure designedl for use when very flimsy goods such as chiffon. taffeta, iiiessalines, etc., are to be woven. Iiilthis structure the latch pin 16 has beenlef't off in order to eliminate the 1. .jerky motloincreated when the pin is sud-l apertures 9 as the tl denly pulled out of the lever S3 swings over to the left side of the vertical center line of the warp head 5.

'.lhe shoe l0 in the modified Structure is carried by a friction band as in the first instance. but instead of' the latclrpin 16, there is provided an auxiliary or brake shoe 30 which is carried by the lever 13. The shoe 3() seats in a recess 3l in 'the inner face of the shoe 1() so that it may be pressed against the metal outer portion 8 of the friction band. The back of the shoe 3() has an out"- standing web V32 which projects through a slot 2li-l iii the lshoe 19. so as to locate its rear edge opposite the pivoted end of the lever 13, said slot coinciding with the space between two ears 34 on the back of the shoe 10.

The ears et'have alined transverse apertures to seat th journals 35 and 36 'of a pivot pin 37 on which the lever 13 is fulcruined. The pivot pin 37 is integral with the journal 235 and it is located off the center with respect thereto, and -the journal 36 has a correspondingly located aperture to seat the outer end of the pin. luto the outer end of the pin 37 is threaded a screw 38 under the head of which a washer 39 which bears against the outer face of' the journal 36 to prevent .endwise separation of the pin from said six inches without changing the tension.`

'r 80 .means of the lock 1s securelymanthe ears,

imanes and they are locked in adjusted pcf Sition by set screws 40 threaded through the ears 3/1.

The aperture in the lever 13 through which the pivot pin 37 -passes is located olf to one side of the longitudinal center line of the lever, and this end of the lever is rounded off so as to produce a cam Which is in contactA with the edge of the Web 32. The lever 13 swings freely on the pivot pin 37, and when it is to the right of the vertical center line of the. Warp? head 5, as shown in Fig. 4, its cam edge is pressing the shoe 30 against the fric-tion. band With suflicient force to positively lock the band to the Warp head for the same purpose as the latch pin 16 in the first-described structure. When the lever 13 moves over to the left of the vertical center line of the warp head, its cam edge recedes from the edge of the Web 32 and allows the shoe 3() to back and break the frictional engagement of the band with the D u u a Warp head.y The friction band 1s novv unlocked from the Warp head as before, and' said band is left free to slide or turn to the right, carrying the lever in the same direction to tilt and again jam the shoe 30 against the 4friction band, and lock the latter to the Warp head.

The y degree of the cam or eccentric action of the lever can be readily adjusted by rotating the journals 35 and 36 of the pivot pll 1t has also been found in practice that for certain heavy goods it is necessary to combine both of the retarding elements disclosed Aon one double shoe.

1 claim:

1. The combination with awarphead, of a. friction band around the same, a line Wrapped around the band and having one end connected thereto, a tension device connected to the other end of the line, a lever carried by the band, and means controlled by the lever for locking the band to the Warp head.

2. The combination with a. Warp head, of a -frictional retarding element therefor, means for loclringisaid element to the :warp head to move therewith, means for periodically releasingE the retarding element, means for returningr said element to locked position when thus released, and means for varying the degree of the frictional engagement of. the retarding element with the Warphead.

The combination with a Warp head, of a. friction band around the same, a tension device engaging the band, a.' lever carried by the band, and means controlled by the lever for locking the bandto the Warp head1 The combination with a Warp head, of a friction band around device engaging the band, means for varying the tension of said device on the band, a lever carried by the band, and means conthe same, a tension j trolled by the lever for locking the band to the Warp head. 5. The combination with a Warp head, of a frictional retardinv element therefor and movable relatively t ereto, means for periodically locking said' element `to the Warp head, and means for varying the tension of the retarding element on the Warp head.

6. The combination with a warp head, ofi

,rying the tension of said device, a pendulous Ielement carried by the band, and means controlled by said element for periodically locking the band to the Warp head to turn therewith and thereafter. to release the band.

8. The combination With a. Warp head, of

a friction band around the same, a line- Wrapped around the band andy having one end connected thereto, a tension device connected to the other end| of the line, a pendulous element carried by the band, and means controlled by saidelement for periodically locking the band tothe `Warp head to turn therevvithand thereafter to release the band.

'9. The combination with. a friction band around the same, a line vwrapped around the band and having one' end connected thereto, a tension device con'- nected tothe other end 4of the line, means for holding selected portions of the Wrapped portion of the line exempt from the influence of the tension device, a pendu'lous element carried by the band, and means controlled by said element for periodically locking the band to the warp head to turn therewith and thereafter to release the band.

10. The combination with a Warp head, of a friction bandA around the same, a line Wrapped around the band and having one end connected thereto, a tension device connectedto the other end of the line, a holding device anchored to the band and engageable with selected portions ofA the Wrapped portion of the line for holding the same exempt from the influence ofthe tert sion device, means for operating said holding device for producing a slack in such exempted portion of the line` a pcndulous element carried by the band, and means controlled by said element for periodically locking the hand to the Warp head to turn therewith and thereafter to release the band.

11. The con'ihination with a warp head, of a friction band around the same, a line wrapped around the band and having one end connected thereto, a tension device connected to the other end of the line, 'a holda Warp head, ofv

ing device anchore gageable with sel wrapped portion of same exem sion devic the band,

the line for holdin pt from the vinfluence of th and means controll nient for periodieall the warp head to tu after to release the 1Q. The combin a. friction band a gageable with th to the warp he carried by the band, 'a carried by the for periodically' d tothe band and enthe band tothe warp head and thereafter ected .portions of the to release the same, and a tension device g the connectedl to the band.

e ten- 13. The combination with a. warp head, of e, a pendulous element carriedby a. friction band around the same, a shoe ened by said elegageable with the band for locking the same y locking the band to to the warp head, a support for the shoe rn therewith and there- Carried by the band, a pendulous element carried by the support andhaving a cam ation with'awarp head, of lmon' periodically operating the shoe to round the-saine, a shoe enlock the band to the Warp head and theree band for locking the same after to release the saine, and a tension de pport Jfor the yshoe vice connected to the bandl pendulons element Intestimony whereof I affix my signature.

support and havingr means' operating the shoe to lock HERMAN J. SATTLER, SR. 

